首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   3161篇
  免费   267篇
  国内免费   45篇
耳鼻咽喉   18篇
儿科学   136篇
妇产科学   55篇
基础医学   354篇
口腔科学   58篇
临床医学   427篇
内科学   579篇
皮肤病学   52篇
神经病学   91篇
特种医学   311篇
外科学   555篇
综合类   239篇
一般理论   3篇
预防医学   212篇
眼科学   16篇
药学   191篇
  2篇
中国医学   32篇
肿瘤学   142篇
  2022年   35篇
  2021年   45篇
  2020年   34篇
  2018年   31篇
  2017年   31篇
  2016年   29篇
  2015年   44篇
  2014年   74篇
  2013年   115篇
  2012年   125篇
  2011年   112篇
  2010年   107篇
  2009年   133篇
  2008年   110篇
  2007年   140篇
  2006年   121篇
  2005年   87篇
  2004年   104篇
  2003年   102篇
  2002年   93篇
  2001年   75篇
  2000年   69篇
  1999年   71篇
  1998年   97篇
  1997年   87篇
  1996年   82篇
  1995年   80篇
  1994年   51篇
  1993年   62篇
  1992年   47篇
  1991年   53篇
  1990年   37篇
  1989年   65篇
  1988年   73篇
  1987年   50篇
  1986年   53篇
  1985年   50篇
  1984年   34篇
  1983年   46篇
  1982年   25篇
  1981年   24篇
  1980年   28篇
  1978年   35篇
  1977年   30篇
  1976年   26篇
  1959年   25篇
  1958年   30篇
  1956年   31篇
  1955年   42篇
  1954年   35篇
排序方式: 共有3473条查询结果,搜索用时 15 毫秒
1.
2.
Background Beating heart surgery has now become the commonest technique of doing Coronary Artery Bypass Graft Surgery (CABG) in our country. It is being used even in such high risk situations like diffuse coronary disease and Critical Left Main stem Stenosis (LMCS) with good results. The aim of this study is to retrospectively review our results in Off-Pump Coronary Artery Bypass Surgery (OPCAB) in patients with critical left main stem stenosis. Methods This study is a retrospective analysis of the data of patients who underwent primary coronary artery bypass surgery. During the period from April 2003 to September 2005 a total of 64 patients underwent OPCAB procedure for critical LMCS. During the same period 10 patients underwent CABG on Cardio Pulmonary Bypass (CPB). The age range was 36–77yrs. The sex distribution was M: F 53∶10. Ten patients were done as emergency. 2 of them were on Intra Aortic Balloon Pump (IABP) support preoperatively. 10 patients were high risk with a Euro score of ≥5. Results Left Internal Mammary Artery (LIMA) was used in 78% of cases. Average grafts per patient was 2.96. The median ventilation time was 5.91 hrs. New IABP insertion in postoperative period was required in 1 patient. One patient was reexplored for bleeding. There was one perioperative myocardial infarction. 57% of patients did not need any blood transfusion. There was no conversion to CPB. There was no operative mortality. Inotropes were used in ten cases. Conclusions OPCAB is a safe method of revascularization in patients with critical LMCS. Preoperative IABP is useful in patients with cardiogenic shock. However, there is a place for CPB in patients needing additional procedures like Mitral Valve repair (MV repair) or Dor's procedure or when the vessels are very diffusely diseased. Those patients who are unstable despite IABP support may be managed by Beating heart On Pump (BHOP) technique.  相似文献   
3.
4.
5.
6.
7.
氟西汀与阿米替林治疗105例抑郁障碍病人的双盲对照试验   总被引:6,自引:4,他引:2  
目的:评价国产氟西汀的抗抑郁作用及安全性。方法:采用随机、双盲对照、多中心研究,分为国产氟西汀组57例(男性22例,女性35例;年龄40±s13a),口服氟西汀20mg,qd,阿米替林57例(男性27例,女性30例;年龄40±14a),口服阿米替林75mg,bid,疗程6wk。结果:氟西汀治疗抑郁障碍的疗效与阿米替林相当,总有效率分别为85%及92%(P>0.05);氟西汀组的主要副作用有口干、便秘、恶心、心动过速等,但较之阿米替林程度轻且发生率低。结论:氟西汀的抗抑郁作用与阿米替林相当,副作用少,服用方便。  相似文献   
8.
This paper aims to place the current changes impacting on nurse education into the wider context of massive organisational and managerial upheaval, at present affecting the entire welfare state. This innovation and structural change is, however, merely an echo of deeper societal processes and the influence of the technological revolution on the private industrial sector and market economy. Within this frame of reference the implications of current reforms for the future organisational form, and management, of colleges of nursing are considered. Concerns are also expressed as to the tenuous control of the professional curriculum.  相似文献   
9.
Colonic atresia: current results of treatment   总被引:3,自引:0,他引:3  
Eleven cases of colonic atresia presenting in a 13-year period are described. The incidence of this condition is estimated at 1 per 66,000 live births in the north-west of England. A higher incidence of involvement of the transverse colon has been noted in comparison with previously reported cases. Survival was unaffected by the type of surgical procedure, with both primary anastomosis after resection or staged reconstruction after initial colostomy giving excellent results. No deaths occurred in the ten patients subjected to surgical treatment.  相似文献   
10.
Aims The Type 1 diabetes susceptibility locus, IDDM2, has been mapped to a variable number of tandem repeats (VNTR) region 5′ upstream of the insulin (INS) and insulin‐like growth factor (IGF2) genes on chromosome 11p15. The function of the VNTR is uncertain; however, it may influence the thymic expression of the insulin gene and affect the development of immune self‐tolerance. The aim of this study was to investigate whether the INS VNTR region is a Type 1 diabetes‐specific locus or acting as a general autoimmunity gene. Methods We genotyped the INS‐IGF2 VNTR [using the surrogate INS?23 HphI single nucleotide polymorphism (SNP)] in 823 Graves’ disease (GD)/multiple sclerosis (MS) families, 1433 GD/MS patients and 837 healthy control subjects. Results We found no evidence of excess transmission of the allele associated with Type 1 diabetes to individuals affected by GD or MS within the families. Analysis of the case–control dataset showed no genotypic or allelic difference between the two populations. Conclusions These data suggest that the INS‐IGF2 VNTR is acting as a Type 1 diabetes‐specific susceptibility gene rather than as an influence on general autoimmunity.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号